#include <stdio.h>
int main() 
{
    int n;
    while (scanf_s("%d", &n) != -1) 
    {
        for (int i = 0; i < n; i++) 
        {
            for (int j = 0; j < n; j++) 
            {
                if (i > 0 && i < n - 1 && j > 0 && j < n - 1) 
                {
                    printf("  ");
                }
                else 
                {
                    printf("* ");
                }
            }
            printf("\n");
        }
    }
    return 0;
}
